Ironwood Electronics SG-BGA User Manual - Manual (Page 10)

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For a more thorough cleaning, use the stiff nylon brush and a
solution of half DI water and half isopropyl alcohol. Wet the
brush, scrub the surfaces of the elastomer, and blow both sides dry
with clean, dry shop air. After allowing to fully dry, clean the
surfaces with the rolled tape method to remove any dust or lint
accidentally deposited in the drying process. Only perform the
thorough cleaning with the elastomer removed from the elastomer
guide.
Surface Mount (SM) Adaptor
See figure 9. If the target
circuit board already exists
or mounting holes cannot be
drilled on the board, then a
SM adaptor can be used with
a GHz socket. SM adapter
can only be made for IC size
27mm or below. SM adapter
has solder balls on the
bottom side and round pads
on the topside. It looks very similar to the actual IC except it is slightly
larger than the IC. It has threaded insert on four corners. GHz socket can
be mounted on to this adapter using the screws that mate into the threaded
insert.
Materials
Non-clad FR4, Phosphorous Bronze pins, 63Sn/37Pb Solder balls,
threaded insert. The solder balls from IC package come in contact with the
top end of elastomer wire. The bottom end of elastomer wire contacts the
SM adaptor board pad. The bottom side of the pad is connected to the target circuit board via solder ball and
thereby makes an electrical path for the signal. Figure 10 illustrates this concept graphically.
Assembly
Ironwood Electronics SMT adaptor can vary greatly in size, mass, and thickness. Because there are many
unknown variables for each customer’s situation, it is difficult to recommend an ideal temperature profile for
attaching an Ironwood adapter to a particular customer’s target board.
A few of the unknowns which make a profile suggestion difficult:
1) The target PCB size, mass
2) Number and size of components next to the adapter target pattern
3) Reflow oven type
4) Type of solder paste/flux used
5) Solder stencil characteristics (thickness and aperture size)
Therefore, we offer the following profiles as a guide / reference to mounting our standard and high temperature
ROHS Giga-snaP™ and BGA SMT adapters. While the following should work for most scenarios, Ironwood
Figure 10: SM Adaptor Signal Path
Figure 9: Surface Mount Adaptor